Cliffgard, John M. Legler, Olin L. Webb, and
Glen E. Woolfenden, was in the area from June 17 to July 5, 1954, and
obtained all of the specimens listed excepting those from 28 miles east
of Grand Junction (Sect. 29, T. 11S, R. 95W), Mesa County, that were
obtained from June 13 to July 2, 1956, by Phillip M. Youngman, and
those from Land's End Road that were obtained on May 13 and 14, and on
October 1, 1948, by D. A. Sutton.

Localities designated by numbers in the accounts to follow are listed
in the legend for Figure 1. Localities 1 and 3 lie below the rim of the
Mesa on the north side. Catalogue numbers are of the Museum of Natural
History of the University of Kansas, unless noted otherwise.

=_Sorex cinereus cinereus_= Kerr.--Two male (59642-59643) Masked Shrews
weighing 4.8 and 4.9 grams were trapped on June 17 at locality 10, and
a nonpregnant female (59644) was trapped on June 26 at locality 6.
_Sorex cinereus_ seemed to be less abundant on the Mesa than _Sorex
vagrans_; more individuals of _S. vagrans_ than of _S. cinereus_ were
trapped on June 17 at locality 10 and on June 26 at locality 6, and _S.
vagrans_ was trapped at three localities where no _S. cinereus_ was
obtained.

[Illustration: FIG. 1. Map of the Grand Mesa (for purposes of this
paper the area above 7500 feet on each side of the northern boundary of
Delta County). The inset of the western three-fourths of Colorado shows
the Grand Mesa in relation to the larger areas of mountains in the
state (areas above 9000 feet are stippled). The following collecting
localities are indicated by numbered, black dots:

(1) 2 mi. N, 9 mi. E Collbran, 7000 ft., Mesa County.
(2) Land's End Road to Grand Mesa, 6800 to 8050 ft., Mesa County.
(3) 3 mi. E, 4 mi. S Collbran, 6800 ft., Mesa County.
(4) 3 mi. E, 9 mi. S Collbran, 10,200 ft., Mesa County.
(5) 5-1/2 mi. E, 11-1/2 mi. S Collbran, _in_ Delta County.
(6) 5-1/2 mi. E, 12 mi. S Collbran, 9600 to 10,400 ft., _in_ Delta County.
(7) 28 mi. E Grand Junction (Sec. 29, T. 11S, R. 95W), Mesa County.
(8) 6 mi. E Skyway, 10,000 to 10,500 ft., _in_ Delta County.
(9) 7 mi. E Skyway, _in_ Delta County.
(10) 8 mi. E, 1/2 mi. S Skyway, 9500 to 10,200 ft., _in_ Delta County.
(11) 8 mi. E, 3/4 mi. S Skyway, 10,200 ft., _in_ Delta County.
(12) 8 mi. E, 1 mi. S Skyway, 10,000 to 10,200 ft., _in_ Delta County.
(13) 8 mi. E, 1-1/2 mi. S Skyway, 8500 to 9600 ft., _in_ Delta County.
(14) 8 mi. E, 2 mi. S Skyway, 9000 ft.,